In regards to the issue of slavery in the territories Buchanan a feared that it would lead to a breakup of the Union.

b. felt strongly about limiting the spread of slavery and supported a bill to prohibit slavery in the

territories.

C. hoped it would be resolved by the Supreme Court.

d. believed it should be determined by voters in each territory.

Correct

d. believed it should be determined by voters in each territory.

Explanation:

James Buchanan was a US a Democrats nominee for the US election in the 1856 who contested John Fremont, a Republican for the post of the presidency of United States of America.

Buchanan in the general election, maintained that slavery was an issue to be decided by individual states and territories rather than the federal government.